AIO-6 Max does not have a SIM card slot and cannot be modified to support one. Its physical design differs from other models, making it incompatible with SIM card insertion. If you need 4G functionality, please choose the AIO-6 LTE model that supports a SIM card.
AIO-6 Max: No SIM Support
The AIO-6 Max has no SIM card slot and can't be modified to take one; choose the AIO-6 LTE if you need 4G.